| 1 | CIE | Czech Government Flying Service | Callsign: Czechia, | CZ | AVCODES |
| 2 | CIE | Czech Government Flying Service | | | ICAO1 |
| 3 | CIE | Iarnrod Eireann (Coras Iompair Eireann) | | IE | VKM |
| 4 | CIEA | CORAL LINES S.A | | | SCAC3 |
| 5 | CIEB | CINDER EXPRESS | | | SCAC3 |
| 6 | CIEC | CENTRAL IOWA ENERGY COOPERATIVE | | | SCAC3 |
| 7 | CIECH | Zakład Komunikacji Miejskiej w Ciechanowie | | PL | TRAFFIC |
| 8 | CIED | CROSSLINE CARRIERS INC | | | SCAC3 |
| 9 | CIEE | CIALES EXPRESS INC | | | SCAC3 |
| 10 | CIEG | CIMARRON EXPRESS INC | | | SCAC3 |
| 11 | CIEG | CIMARRON EXPRESS INC | | | SCAC4 |
| 12 | CIEH | CHELA LOGISTICS INC | | | SCAC4 |
| 13 | CIEI | CITY OF EVANSTON | | | SCAC3 |
| 14 | CIEK | CORRIEA TRUCKING CO | | | SCAC3 |
| 15 | CIEK | CIM LOGISTICS INC | | | SCAC4 |
| 16 | CIEL | CONTINENTAL LIMOUSINE SERVICE | | | SCAC3 |
| 17 | CIEL | CRUCES INTERNACIONALES ELIAND | | | SCAC4 |
| 18 | CIEN | CLINE ENERGY INC | | | SCAC4 |
| 19 | CIEO | CITY EXPRESS INC | | | SCAC3 |
| 20 | CIEP | CITY EXPRESS | | | SCAC3 |
| 21 | CIEP | CITY EXPRESS | | | SCAC4 |
| 22 | CIEQ | CARLISLE CARRIER CORP | | | SCAC3 |
| 23 | CIEQ | CARLISLE CARRIER CORP | | | SCAC4 |
| 24 | CIES | CITRUS EXPRESS INC | | | SCAC3 |
| 25 | CIES | CITRUS EXPRESS INC | | | SCAC4 |
| 26 | CIET | CIEUTAT PRODUCE CO | | | SCAC3 |
| 27 | CIEU | CEMINLOG | | F | BIC |
| 28 | CIEU | CORAS IOMPAIR EIREANN | | | SCAC3 |
| 29 | CIEU | IARNROD EIREANN | | | SCAC4 |
| 30 | CIEV | CROSS CARRIERS INC | | | SCAC3 |
| 31 | CIEW | CONTAINER EXPRESS | | | SCAC3 |
| 32 | CIEW | CONTAINER EXPRESS | | | SCAC4 |
| 33 | CIEY | CHEMSTREAM INC | | | SCAC4 |
